The synergistic mechanism of phytic acid monolayers and iodide ions for inhibition of copper corrosion in acidic media

Abstract

The adsorption behavior of phytic acid (PA) self-assembled monolayers (SAMs) at the copper surface, and its corrosion inhibition mechanism in 0.5 M H₂SO₄ solution, was studied by using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and surface-enhanced Raman scattering spectroscopy (SERS). Raman studies showed that PA SAMs on the copper surface formed via P–O bonding and the cyclohexyl ring. The adsorption of PA SAMs on copper surface followed Langmuir isotherm behavior and revealed chemical adsorption on the copper surface. The presence of I⁻ ions with PA SAMs at the copper surface showed a synergistic effect and increased the inhibition efficiency.